I just wanted to say, it works now for me, i found a way :-) now it looks like this:
Arcade >
Vertical Shmups
Horizontal Shmups
i first used this tool from here: http://forum.arcadecontrols.com/index.php/topic,149708.msg1563036.html#msg1563036
to create gamelists per genre, each roms in a separate folder. (you can create your own genre bat files by editing catver, or similar.ini's)
I then added the first folder to "arcade" got all the infos, pics, videos, then renamed the Aracde to the genre (ie. vertical Shmups).
You then need to move all the images from Arcade to Vertical Shmups, so Arcade folder is free again.
Then add the next gamelist to arcade, and do the same, download all images, videos ect. rename it and then move all the Images to the new folder.
greets Nedo